Humminbird 161 manual How Sonar Works

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How Sonar Works

Sonar technology is based on sound waves. The 100 SeriesTM Fishing System uses sonar to locate and define structure, bottom contour and composition, as well as depth directly below the transducer.

Your 100 SeriesTM Fishing System sends a sound wave signal and determines distance by measuring the time between the transmission of the sound wave and when the sound wave is reflected off of an object; it then uses the reflected signal to interpret location, size, and composition of an object.

Sonar is very fast. A sound wave can travel from the surface to a depth of 240 ft (70 m) and back again in less than 1/4 of a second. It is unlikely that your boat can "outrun" this sonar signal.

SONAR is an acronym for SOund and NAvigation Ranging. Sonar utilizes precision sound pulses or "pings" which are emitted into the water in a teardrop-shaped beam.

The sound pulses "echo" back from objects in the water such as the bottom, fish and other submerged objects. The returned echoes are displayed on the LCD screen. Each time a new echo is received, the old echoes are moved across the LCD, creating a scrolling effect.

When all the echoes are viewed side by side, an easy to interpret "graph" of the bottom, fish and structure appears.

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Contents GPS Chartplotter Operations Manual Thank You Table of Contents Key Functions IiiSonar Menu Tab Chart Menu Tab Specifications Glossary Contact Humminbird 103 How Sonar Works Peak to Peak measures power output at the highest points Single Beam Sonar How GPS and Cartography WorkPage What’s On the Display Bait Ball Hard Bottom Rocky BottomStructure where fish may be hiding Adjacent to your boat, including the following itemsZoom View Chart View Big Digits View ViewsSonar views Sonar ViewSonar View Understanding Sonar History Real Time Sonar RTS WindowFreeze Frame Bottom PresentationPage Sonar Zoom View Sonar Zoom ViewBig Digits View Circular Flasher ViewBird’s Eye View Bird’s Eye ViewChart View Chart View without Active CursorCombo View View OrientationChart View with Cursor Present Viewing CartographyIntroduction to Navigation Waypoints, Routes and TracksSave, Edit, or Delete a Waypoint Navigate to a Waypoint or Position Navigation X-PressTMmenu Add a Waypoint Target or Trolling GridSave, Edit or Delete a Route Save or Clear a Current Track Edit, Delete or Hide Saved TracksPOWER/LIGHT Key Key FunctionsView Key Info KeyMenu Key WAY Cursor Control KeyMark Key Goto KeyZoom +/- Key Exit KeyPowering Up the Unit Menu SystemSonar Tab Normal Mode Advanced Mode Normal Simulator System Status Start-Up Options MenuNormal Operation Simulator System StatusAccessory Test Self TestGPS Diagnostic View GPS Diagnostic ViewSonar X-PressTMMenu Sonar views onlyHighlight Sensitivity on the Sonar X-PressTMmenu To adjust the SensitivitySensitivity To adjust the Upper Range Upper RangeHighlight Lower Range on the Sonar X-PressTMmenu To adjust the Lower RangeLower Range Chart Speed To adjust the Chart SpeedTo adjust the Bottom View Bottom ViewTo adjust the Bottom Range Bottom RangeBottom Lock To turn on Bottom LockCancel Navigation To Cancel NavigationHighlight Cancel Navigation on the Sonar X-PressTMmenu Only when NavigatingNavigation X-PressTMMenu Navigation views onlyWaypoint Name To view the Waypoint Name SubmenuHighlight WaypointName on the Navigation X-PressTMmenu Waypoint Submenu contains the following menu choicesChart or Combo view only Cursor to WaypointSave Current Track To move cursor to a saved waypointSkip Next Waypoint Clear Current TrackSave Current Route Highlight Cancel Navigation on the Navigation X-PressTMmenu Remove TargetTo Remove a Target Only if a Target is ActiveRemove Grid Sonar WindowTo Remove a Grid To Set the Size of the Sonar Window in the Combo ViewMost recently-created waypoint Sonar tab Press the Menu key twice to access the Main MenuSonar Menu Tab Fish ID+TM To turn Fish ID+ on or offTo change the Fish ID Sensitivity setting To change the RTS Window settingFish ID Sensitivity Highlight Fish ID Sensitivity on the Sonar main menuTo change the Zoom Width Setting To change the Depth Lines settingZoom Width Depth LinesTo change the Surface Clutter setting Surface ClutterTo change the Noise Filter setting To change the Max Depth settingNoise Filter Max DepthTo change the Water Type setting Water TypeNavigation Menu Tab Navigation tabCurrent Track Current Track allows you to view the Current Track submenuTo view the Current Track Submenu Highlight Current Track on the Navigation main menuSaved Tracks Saved Tracks allows you to view the Saved Tracks submenuTo view the Saved Tracks Submenu Highlight Saved Tracks on the Navigation main menuWaypoints To view the Waypoints SubmenuHighlight Waypoints on the Navigation main menu Waypoints Submenu contains the following menu choicesRoutes To view the Routes SubmenuHighlight Routes on the Navigation main menu Routes Submenu contains the following menu choicesGrid Rotation Chart OrientationNorth Reference To change the Trackpoint Interval setting To change the Track Minimum Distance settingTrackpoint Interval Track Min DistanceDelete All Nav Data Map DatumCourse Projection Line Chart Menu Tab Highlight Chart Detail Level on the Chart main menu Chart Detail LevelTo change the Chart Detail Level setting To change the Map Borders setting To change the Lat/Lon Grid settingMap Borders Lat/Lon GridSet Simulation Position To set the Simulation PositionTo change the Map Offset setting Set Map OffsetClear Map Offset To Clear Map OffsetAlarms Menu Tab Depth Alarm Fish ID AlarmTo change the Depth Alarm setting To change the Fish ID Alarm settingLow Battery Alarm Temp AlarmTo change the Low Battery Alarm setting To change the Temp Alarm settingOff Course Alarm Arrival AlarmTo change the Off Course Alarm setting To change the Arrival Alarm settingDrift Alarm Alarm ToneTo change the Drift Alarm setting To change the Alarm Tone settingSetup Menu Tab Units Distance Units DepthUnits Temp Language User ModeUnits Speed Triplog Reset Restore DefaultsTo Reset Triplog To Restore DefaultsSelect Readouts Advanced, Sonar view onlyTo Select Readouts To change the Depth Offset settingDepth Offset To change the Temp Offset setting To change the Speed Calibration settingTemp Offset Speed CalibrationTo change the Daylight Saving Time setting Local Time ZoneDaylight Saving Time To change the Local Time ZoneTo change the Position Format setting Position FormatTime Format To change the Time FormatTo change the Date Format Date FormatNmea Output To turn Sonar on or off SonarTo turn Nmea Output on or off Views Menu Tab Combo ViewTo Change the View Status of Any View Highlight the View main menu tabTroubleshooting SeriesTM Defaults to Simulator with a Transducer AttachedOr faulty Display ProblemsProblem Possible Cause Finding the Cause of Noise IsolationBoat’s engine Cavitation fromSpecifications Glossary Sonar TermsPage Page Page Page Receiver See Transmitter Page Page Page GPS & Navigation Terms Page Page 100 101 102 103 104 Contact Humminbird 105